author | koda |
Sat, 13 Nov 2010 01:24:39 +0100 | |
changeset 4287 | 7dbdc862097c |
parent 3922 | 44804043b691 |
child 4476 | 4bf74e158f44 |
permissions | -rw-r--r-- |
3547 | 1 |
/* |
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* CGPointUtils.c |
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* PinchMe |
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* |
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* Created by Jeff LaMarche on 8/2/08. |
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* Copyright 2008 __MyCompanyName__. All rights reserved. |
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* |
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*/ |
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#include "CGPointUtils.h" |
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3922
44804043b691
iPad Video Out support (+less warnings +code update for latest SDL)
koda
parents:
3547
diff
changeset
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#include "math.h" |
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CGFloat distanceBetweenPoints (CGPoint first, CGPoint second) { |
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CGFloat deltaX = second.x - first.x; |
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CGFloat deltaY = second.y - first.y; |
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return sqrt(deltaX*deltaX + deltaY*deltaY ); |
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} |
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CGFloat angleBetweenPoints(CGPoint first, CGPoint second) { |
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CGFloat height = second.y - first.y; |
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CGFloat width = first.x - second.x; |
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CGFloat rads = atan(height/width); |
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return radiansToDegrees(rads); |
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} |
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CGFloat angleBetweenLines(CGPoint line1Start, CGPoint line1End, CGPoint line2Start, CGPoint line2End) { |
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CGFloat a = line1End.x - line1Start.x; |
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CGFloat b = line1End.y - line1Start.y; |
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CGFloat c = line2End.x - line2Start.x; |
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CGFloat d = line2End.y - line2Start.y; |
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CGFloat rads = acos(((a*c) + (b*d)) / ((sqrt(a*a + b*b)) * (sqrt(c*c + d*d)))); |
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return radiansToDegrees(rads); |
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} |